苦心

painstaking effort / to take a lot of trouble / laborious at pains

Characters and words in 苦心

= ku + Ø3
bitter / hardship / pain / to suffer / to bring suffering to / painstakingly
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xīn = xi + (e)n1
heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]
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